Fraunhofer Lines

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Fraunhofer Lines </dt>
Dark lines in the absorption spectrum of solar radiation due to absorption by gases in the outer portions of the sun and in the earth's atmosphere. </dd>
''Fraunhofer lines are designated by letters, as the K-line, or by wavelength, as the 4046-angstrom line of iron. </dd>
'The major Fraunhofer lines are:

<tbody> </tbody>

	angstroms (nm)	Line due to
A	7594	Telluric oxygen
B	6867	Telluric oxygen
C	6563	hydrogen, HMissing Image:img src="SP7-f_files/alphasm.html"
D1	5896	sodium
D2	5890	sodium
D3	5876	helium
E	5270	iron and calcium
b1	5184	magnesium
F	4861	hydrogen, HMissing Image:img src="SP7-f_files/betasm.html"
G	4308	iron (and calcium)
H	3968	calcium
K	3934	calcium

[[/a>|/a>

]]</dd>

References

This article is based on NASA's Dictionary of Technical Terms for Aerospace Use